united arab republic has 2 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a republic in northeastern Africa known as the United Arab Republic until 1971; site of an ancient civilization that flourished from 2600 to 30 BC
Synonyms, antonyms and the broader and narrower relations for united arab republic come from Princeton University’s WordNet. Full sources and licences.